Process for removal of sulfur oxides from waste gases
AssigneeKoppers Company, Inc.
InventorPhilip S. Lowell
Life of this patent
Estimating the term…
Abstract
A process for removing sulfur dioxide from waste gas is provided. The gas is first contacted with an alkaline scrubbing liquor consisting essentially of a sorbent salt in which the cation is sodium or potassium, and one of the anions is borate. The clean gas is vented and the sorbent liquor regenerated for recycle by treatment with lime to precipitate insoluble calcium-sulfur compounds for disposal and regenerate the alkalinity of the scrubbing liquor.
Claims16
A method for the removal of sulfur dioxide from industrial waste gas containing same comprising:
- (a) scrubbing said gas with an aqueous alkaline liquor, consisting essentially of a sorbent salt in which the cation is sodium or potassium and borate is one of the anions, in an amount sufficient to react with substantially all of the sulfur dioxide present in said gas;
- (b) venting the resultant waste gas and treating the resultant spent liquor with lime in an amount sufficient to regenerate the scrubbing liquor by precipitating insoluble calcium-sulfur containing salts and regenerating the borate ion;
- and
- (c) separating the resultant, insoluble waste solids and recycling the sorbent liquor to step (a).
The method for the removal of sulfur dioxide from industrial waste gas containing same comprising:
- (a) scrubbing said waste gas with an aqueous alkaline slurry, the liquid portion of the slurry consisting essentially of a sorbent salt in which the cation is sodium or potassium and borate is one of the anions, in an amount sufficient to remove substantially all of the sulfur dioxide present in said gas;
- (b) venting the resultant waste gas and treating the resultant spent slurry with lime in an amount sufficient to regenerate the scrubbing slurry by precipitating insoluble calcium-sulfur containing salts and regenerating the borate ion;
- and
- (c) separating waste solids from a portion of the slurry and removing said solids from the process and returning the liquid from said portion to the process.
Dependencies are inferred from the claim text.